Crangan Bay is a coastal suburb of the Central Coast region of New South Wales, Australia, located between Budgewoi and Swansea on the bay of the same name. It is part of the Central Coast Council local government area.

The suburb is an unpopulated bushland area and has not been subject to urban development. The major land owners are the local aboriginal land council and land held by an urban development company and the Coal and Allied mining company, who intend to turn this area into a suburb.

The only residing land owners operate a concrete recycling depot and gravel quarry, which contains a regionally significant quantity of conglomerate used for road base. This product has been extensively used by Wyong Shire Council in the construction of local roads.

This bay is part of the greater Wallarah Peninsula and Lower Hunter bioregions.